Self Healing Injection Ports, 20mm

Lids For Mason jars:Mushroom Liquid/spawn Culture Regular Mouth Lids
Mainly Used For mushroom growing and liquid culture production.silicone injection port Use with hypodermic needles to inject cultures, therefore never needing to remove the lids on your culture jars.
Rubber Bottle Stoppers Great for liquid culture, BRF Jars, injection, Supplemented substrate jars, Grain Masters .stoppers can be used to make self-healing injection ports in Mason jar lids or medicine bottles.
Self Healing Port are 3/4” across the top, and 5/16” top to bottom. Simply use a 7/16 to 1/2 inch drill bit and drill a hole in metal or plastic jar lid and the stoppers pop right in place.